Psalms 105:43

As the believer commonly thrives best in his soul when under the cross; so the church also flourishes most in true holiness, and increases in number, while under persecution. Yet instruments shall be raised up for their deliverance, and plagues may be expected by persecutors. And see the special care God took of his people in the wilderness. All the benefits bestowed on Israel as a nation, were shadows of spiritual blessings with which we are blessed in Christ Jesus. Having redeemed us with his blood, restored our souls to holiness, and set us at liberty from Satan's bondage, he guides and guards us all the way. He satisfies our souls with the bread of heaven, and the water of life from the Rock of salvation, and will bring us safely to heaven. He redeems his servants from all iniquity, and purifies them unto himself, to be a peculiar people, zealous of good works.

And he brought forth his people with joy, and his chosen with gladness. Up from the wilderness he led them, rejoicing over them himself and making them rejoice too. They were his people, his chosen, and hence in them he rejoiced, and upon them he showered his favours, that they might rejoice in him as their God, and their portion.